Like Sirius, XM has redundant satellites, it was only one of the satellites (and the repeaters) that was having trouble today. As a result if your antenna maintained a constant view of the one functioning satellite your reception would be just fine.

This is impossible in a moving vehicle, so coverage in a car would have been somewhere between spotty and unlistenable depending on your environment.With the repeaters down people in urban environments would have, in general, very bad reception today.

People with a stationery antenna in an area not covered by repeaters probably would not have noticed any problems today.